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Upgrading system memory
The computer comes with double data rate 4 synchronous dynamic random access memory (DDR4-SDRAM)
dual inline memory modules (DIMMs).
DIMMs
The memory sockets on the system board can be populated with up to four industry-standard DIMMs. These
memory sockets are populated with at least one preinstalled DIMM. To achieve the maximum memory
support, you can populate the system board with up to 64 GB of memory configured in a high-performing
dual channel mode.
DDR4-SDRAM DIMMs
For proper system operation, the DIMMs must adhere to the following specifications:
Industry-standard 288-pin
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Unbuffered non-ECC PC4-17000 DDR4-2133 MHz-compliant
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1.2 volt DDR4-SDRAM DIMMs
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CAS latency 15 DDR4 2133 MHz (15-15-15 timing)
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Mandatory JEDEC SPD information
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The computer supports the following:
512-MB, 1-GB, 2-GB, and 4-GB non-ECC memory technologies
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Single-sided and double-sided DIMMs
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DIMMs constructed with x8 and x16 DDR devices; DIMMs constructed with x4 SDRAM are not supported
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NOTE:
The system will not operate properly if you install unsupported DIMMs.
Populating DIMM sockets
There are four DIMM sockets on the system board, with two sockets per channel. The sockets are labeled
DIMM1, DIMM2, DIMM3, and DIMM4. Sockets DIMM1 and DIMM2 operate in memory channel B. Sockets DIMM3
and DIMM4 operate in memory channel A.
The system will automatically operate in single channel mode, dual channel mode, or flex mode, depending
on how the DIMMs are installed.
NOTE:
Single channel and unbalanced dual channel memory configurations will result in inferior graphics
performance.
The system will operate in single channel mode if the DIMM sockets are populated in one channel only.
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The system will operate in a higher-performing dual channel mode if the total memory capacity of the
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DIMMs in Channel A is equal to the total memory capacity of the DIMMs in Channel B. The technology and
device width can vary between the channels. For example, if Channel A is populated with two 1-GB
DIMMs and Channel B is populated with one 2-GB DIMM, the system will operate in dual channel mode.
The system will operate in flex mode if the total memory capacity of the DIMMs in Channel A is not equal
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to the total memory capacity of the DIMMs in Channel B. In flex mode, the channel populated with the
least amount of memory describes the total amount of memory assigned to dual channel and the
remainder is assigned to single channel. For optimal speed, the channels should be balanced so that the
largest amount of memory is spread between the two channels. If one channel will have more memory
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Chapter 2 Hardware upgrades
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